20390895 has 48 divisors (see below), whose sum is σ = 42531840. Its totient is φ = 8828352.

The previous prime is 20390893. The next prime is 20390911. The reversal of 20390895 is 59809302.

It is not a de Polignac number, because 20390895 - 2¹ = 20390893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20390891) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4282 + ... + 7688.

It is an arithmetic number, because the mean of its divisors is an integer number (886080).

Almost surely, 2^20390895 is an apocalyptic number.

20390895 is an abundant number, since it is smaller than the sum of its proper divisors (22140945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20390895 is a wasteful number, since it uses less digits than its factorization.

20390895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20390895 is about 4515.6278633209. The cubic root of 20390895 is about 273.1987844961.

The spelling of 20390895 in words is "twenty million, three hundred ninety thousand, eight hundred ninety-five".